*{margin: 0;padding: 0;}

body{
    font-size: 16px;
}
a{
    text-decoration:none;
    color: #3f3f3f;
}
li{
    list-style: none;
}
.clearfix::after{
    display: block;
    content: "";
    clear: both;
}

//宽度
.wrap{
    width: 1170px;    
    margin: 0 auto;
}
